A352007 - cp's OEIS frontend

A352007 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/2)} 3^k * a(k) * a(n-2*k-1).

n	a(n)
0	1
1	1
2	1
3	4
4	7
5	19
6	40
7	178
8	379
9	1237
10	2941
11	10378
12	24628
13	78928
14	198820
15	813550
16	1971907
17	6587245
18	16980079
19	61488286
20	155573011
21	515316037
22	1363261084
23	4937498686
24	12796438252
25	42078038668
26	113153315824
27	390012381346
28	1036020692356
29	3379994401042
30	9240830253940

[1, 1, 1, 4, 7, 19, 40, 178, 379, 1237, 2941, 10378, 24628, 78928, 198820, 813550, 1971907, 6587245, 16980079, 61488286, 155573011, 515316037, 1363261084, 4937498686, 12796438252, 42078038668, 113153315824, 390012381346, 1036020692356, 3379994401042, 9240830253940]

cp's OEIS Frontend

A352007 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/2)} 3^k * a(k) * a(n-2*k-1).

Table of values

List of values